19490433617 has 2 divisors, whose sum is σ = 19490433618. Its totient is φ = 19490433616.

The previous prime is 19490433601. The next prime is 19490433653. The reversal of 19490433617 is 71633409491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19118869441 + 371564176 = 138271^2 + 19276^2 .

It is a cyclic number.

It is not a de Polignac number, because 19490433617 - 2⁴ = 19490433601 is a prime.

It is not a weakly prime, because it can be changed into another prime (19490433667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9745216808 + 9745216809.

It is an arithmetic number, because the mean of its divisors is an integer number (9745216809).

Almost surely, 2^19490433617 is an apocalyptic number.

It is an amenable number.

19490433617 is a deficient number, since it is larger than the sum of its proper divisors (1).

19490433617 is an equidigital number, since it uses as much as digits as its factorization.

19490433617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 19490433617 in words is "nineteen billion, four hundred ninety million, four hundred thirty-three thousand, six hundred seventeen".